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Allow i/s to match (gv+c). This fixes CodeGen/PowerPC/2007-05-03-InlineAsm-S-Constraint.ll
and PR1382 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36672 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1915,22 +1915,43 @@ SDOperand TargetLowering::isOperandValidForConstraint(SDOperand Op,
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case 'i': // Simple Integer or Relocatable Constant
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case 'n': // Simple Integer
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case 's': // Relocatable Constant
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case 'X': // Allows any operand.
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// These are okay if the operand is either a global variable address or a
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// simple immediate value. If we have one of these, map to the TargetXXX
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// version so that the value itself doesn't get selected.
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if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
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case 'X': { // Allows any operand.
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// These operands are interested in values of the form (GV+C), where C may
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// be folded in as an offset of GV, or it may be explicitly added. Also, it
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// is possible and fine if either GV or C are missing.
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ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
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GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Op);
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// If we have "(add GV, C)", pull out GV/C
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if (Op.getOpcode() == ISD::ADD) {
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C = dyn_cast<ConstantSDNode>(Op.getOperand(1));
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GA = dyn_cast<GlobalAddressSDNode>(Op.getOperand(0));
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if (C == 0 || GA == 0) {
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C = dyn_cast<ConstantSDNode>(Op.getOperand(0));
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GA = dyn_cast<GlobalAddressSDNode>(Op.getOperand(1));
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}
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if (C == 0 || GA == 0)
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C = 0, GA = 0;
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}
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// If we find a valid operand, map to the TargetXXX version so that the
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// value itself doesn't get selected.
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if (GA) { // Either &GV or &GV+C
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if (ConstraintLetter != 'n') {
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int64_t Offs = GA->getOffset();
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if (C) Offs += C->getValue();
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return DAG.getTargetGlobalAddress(GA->getGlobal(), Op.getValueType(),
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Offs);
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}
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}
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if (C) { // just C, no GV.
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// Simple constants are not allowed for 's'.
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if (ConstraintLetter != 's')
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return DAG.getTargetConstant(C->getValue(), Op.getValueType());
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}
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if (GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Op)) {
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if (ConstraintLetter != 'n')
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return DAG.getTargetGlobalAddress(GA->getGlobal(), Op.getValueType(),
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GA->getOffset());
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}
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break;
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}
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}
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return SDOperand(0,0);
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}
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